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UBA - CienciaS :: Ver Tema - final 16/08/02 y otros mezcladitos
UBA - CienciaS
http://ubacs.com.ar/ubacs/

final 16/08/02 y otros mezcladitos
http://ubacs.com.ar/ubacs/viewtopic.php?f=37&t=960
Página 1 de 1

Autor:  micaela [ 05 Abr 2009, 16:25 ]
Asunto:  final 16/08/02 y otros mezcladitos

Les dejo ejercicios q no logre hacer, espero puedan ayudarme


>> Sea f:R⇒R tal que f(t+u)=f(t)f(u) ∀t,uϵR
f(0)≠0 y f' (0)=1
Probar que:
F es continua
F es derivable
F(x)>0 ∀xϵR
F es creciente


>>Probar que -3<xy<3 si x^2/8+y^2/2=1

>>Encontrar f:R^2⇒R tal que:
∂f/∂x (0,0)=0 ; ∂f/∂y (0,0)=0 ; ∂f/∂v=3 con v=(1;1)
Probar entonces que f no es diferenciable en (0,0)

>>Sea f:R^2⇒R dif. Tq ∇f(1,1)= 0 (vector) y el hessiano en (1,1) es Hf(1,1)(h_1,h_2)=-3h_1^2
Decidir justificando las resp. Si las sig afirmaciones son VoF:
1)f tiene máx. local en (1,1)
2)f no tiene mín. local en (1,1)
3)Faltan datos para poder decidir si (1,1) es pto silla o si f tiene extremo local en (1.1)

Autor:  exequiel131719 [ 05 Abr 2009, 17:29 ]
Asunto:  Re: final 16/08/02 y otros mezcladitos

Para el primero:

Espero no haberte confundido más. Saludos.

Autor:  micaela [ 05 Abr 2009, 21:43 ]
Asunto:  Re: final 16/08/02 y otros mezcladitos

posta que a mi sola todo eso no se me ocurre....
tengo que releerlo un par de veces mas para que me cierren algunas cositas pero en la generalidad lo entendi...
muchas gracias

Autor:  exequiel131719 [ 05 Abr 2009, 21:55 ]
Asunto:  Re: final 16/08/02 y otros mezcladitos

No, es culpa mía, por emocionarme con ese camino. Una forma mucho más sencilla:

Espero que esta resolución se entienda más. Te pido disculpas; es la obsesión de borrar hipótesis, porque en la otra forma uso realmente la continuidad. Bueno, de nuevo disculpas, y espero que ayudo. Saludos.

Autor:  Quimey [ 05 Abr 2009, 22:35 ]
Asunto:  Re: final 16/08/02 y otros mezcladitos

Te dejo la idea de los otros, intenta escribirlo con detalle, cualquier cosa avisa.
Intentá usar tex para escribir tus soluciones.
2)


3)

Autor:  micaela [ 06 Abr 2009, 16:10 ]
Asunto:  Re: final 16/08/02 y otros mezcladitos

ay muchas muchas gracias... el ejercicio 1 ahora sii lo entendi!!

ahora me pongo con los multiplicadores gracias!!

Autor:  ltaravilse [ 26 Sep 2009, 12:20 ]
Asunto:  Re: final 16/08/02 y otros mezcladitos

Tengo una solución mucho más sencilla para el 2 que usando multiplicadores de Lagrange pero no se si está bien:



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